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Marty Lurie describes how to use SQL to analyze the logs of a Web server to understand how people use the site and performance issues. Using Linux clusters with a shared nothing database can improve the performance of that processing. Examples are shown using IBM-Informix XPS Developers Kit. Read Web Click Stream Analysis using Linux Clusters tutorial here. (http://www.opensourcetutorials.com/tutorials/Server-Side-Coding/PHP/web-click-stream-analysis/page1.html)